While is a goldmine for MQL4 libraries and indicators, a functional EX4 decompiler is a "white whale." Most repositories you find will either be outdated or highly technical tools for reverse engineers. If you’ve lost your source code, your best bet is often a manual rewrite rather than relying on automated decompilation.
Before MetaQuotes updated the MT4 platform (specifically after Build 600), decompilers were common. The old EX4 files were essentially obfuscated scripts that could be easily reverted to readable MQ4 code. ex4 decompiler github
If you have the EX4 and understand what the bot does, you can hire a developer on the official MQL5 forum to rewrite the logic from scratch in a new MQ4 file. While is a goldmine for MQL4 libraries and
You may find repositories containing old code from 2010–2014. These will not work on modern MT4 builds and will likely fail to open your file. The Risks of "Free" Decompilers The old EX4 files were essentially obfuscated scripts
When searching for "ex4 decompiler" on GitHub, you will generally find three types of repositories:
Instead of hunting for a "magic" GitHub repository, consider these options: